Find geo-points within a specified minimum and maximum distance from a
central point.

geo_polygon

Find geo-points that fall within the specified polygon. This filter is
very expensive. If you find yourself wanting to use it, you should be
looking at geo-shapes instead.

Each filter performs a slightly different calculation to check whether a point
falls into the containing area, but the process is similar. The requested area
is converted into a range of quad/geohash prefix tokens and used to search the
inverted index for documents who share the same tokens.

Geo-filters are relatively expensive — they should be used on as few documents as
possible. First remove as many documents as you can with cheaper filters, like
term or range filters, and apply the geo-filters last.

The bool filter will do this for you automatically. First it
applies any bitset-based filters (see All About Caching) to exclude as many
documents as it can as cheaply as possible. Then it applies the more
expensive geo or script filters to each remaining document in turn.